Does L-citrulline improve exercise performance?

A recent review found a small context-dependent signal, but certainty was low to very-low and reliable target populations were not established (PMID:42356270).

Does L-citrulline improve endurance?

Two meta-analyses found no significant aerobic or acute endurance benefit in the studied populations (PMID:36079738; PMID:37155582).

Can citrulline reduce soreness?

One meta-analysis found a 24-hour soreness signal but not a 72-hour effect, and blood lactate was unchanged (PMID:33308806).

Is citrulline malate the same as L-citrulline?

No. They are different forms and should not be treated as interchangeable when comparing labels or research protocols.

Supplement guide Performance

L-Citrulline

Evidence for L-citrulline shows small, context-dependent performance signals with low to very-low certainty, while dosing and target populations remain unestablished (PMID:42356270). Meta-analyses also report no significant aerobic or acute endurance benefit, despite limited signals for lower perceived exertion and 24-hour soreness (PMID:36079738; PMID:33308806; PMID:37155582).

At a glance

Snapshot

Primary goal: Evaluate mixed, low-certainty exercise evidence without assuming a reliable performance benefit.
Dosage range: Research context only: 8 g citrulline malate was the most common protocol in one 13-study analysis (PMID:33308806).
Best time to take: Within two hours before exercise in the supplied acute recovery analysis.
Time to effect: Protocol-dependent; supplied evidence includes acute and chronic approaches.
Common stacks: The supplied evidence does not establish evidence-based combinations.
Intake notes: L-citrulline and citrulline malate are not interchangeable. Review cardiovascular conditions, medicines, pregnancy, breastfeeding, and surgery with a clinician.

Use and selection

Buying Guide

Everything you need to know to make an informed decision about L-Citrulline

Why It Matters

Labels should identify L-citrulline or citrulline malate and state the amount; research findings should not be transferred between forms automatically.

How L-Citrulline Helps You

Overall performance evidence

A 2026 meta-analysis reported a small context-dependent signal with low to very-low certainty and wide prediction intervals (PMID:42356270).

Aerobic outcomes

A 10-study meta-analysis found no significant aerobic performance, RPE, VO2 kinetics, or lactate benefit (PMID:36079738).

Recovery signals

A meta-analysis reported lower RPE and 24-hour soreness signals, but no lactate or 72-hour soreness effect (PMID:33308806).

Acute endurance

Nine studies in young healthy adults found no significant acute endurance benefit (PMID:37155582).

Frequently Asked Questions

Common questions about L-Citrulline answered by our experts

Does L-citrulline improve exercise performance?: A recent review found a small context-dependent signal, but certainty was low to very-low and reliable target populations were not established (PMID:42356270).
Does L-citrulline improve endurance?: Two meta-analyses found no significant aerobic or acute endurance benefit in the studied populations (PMID:36079738; PMID:37155582).
Can citrulline reduce soreness?: One meta-analysis found a 24-hour soreness signal but not a 72-hour effect, and blood lactate was unchanged (PMID:33308806).
Is citrulline malate the same as L-citrulline?: No. They are different forms and should not be treated as interchangeable when comparing labels or research protocols.